We propose the concept of activity-section flow chart to support BPR,which is the combination of the existing activity flow chart and section flow chart. Based on the new concept, a human-computer in-teractive approach for BPR is developed. It can find out the unreasonable activity loops and excessive busi-ness rounds between sections by the adjective and reachable matrices. The approach had been applied to an iron and steel works. The satisfactory results were achieved.